JPS57143734A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS57143734A
JPS57143734A JP56028783A JP2878381A JPS57143734A JP S57143734 A JPS57143734 A JP S57143734A JP 56028783 A JP56028783 A JP 56028783A JP 2878381 A JP2878381 A JP 2878381A JP S57143734 A JPS57143734 A JP S57143734A
Authority
JP
Japan
Prior art keywords
magnetic
magnetic layer
magnetic powder
recording medium
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56028783A
Other languages
Japanese (ja)
Other versions
JPH0353689B2 (en
Inventor
Masahiro Amamiya
Akira Miyake
Hiroshi Zaitsu
Yoshinori Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP56028783A priority Critical patent/JPS57143734A/en
Publication of JPS57143734A publication Critical patent/JPS57143734A/en
Publication of JPH0353689B2 publication Critical patent/JPH0353689B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/716—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by two or more magnetic layers

Abstract

PURPOSE:To improve corrosion resistance and surface smoothness of a magnetic recording medium, by laminating the first magnetic layer containing oxide magnetic powder, and the second magnetic layer containing metallic magnetic powder having a specific saturation magnetizing quantity, on a base body. CONSTITUTION:The first magnetic layer is formed by applying a magnetic painting material consisting of oxide magnetic powder (example: gamma-Fe2O3) whose coercive force is 400-600 oersteds, a binder and an organic solvent, on a base body of a polyester film, etc., and drying it. Subsequently, the second magnetic layer is formed by applying a magnetic painting material consisting of metallic magnetic powder (example: Fe, Co) whose saturation magnetizing quantity is 140emu/g and whose coercive force is 600-1,200 oersteds, a binder and an organic solvent, on said first magnetic layer, and drying it. In this way, the drop- down rate of residual magnetic flux density, and surface roughness become small enough, and corrosion resistance and surface smoothness of the magnetic layer are improved.
JP56028783A 1981-02-27 1981-02-27 Magnetic recording medium Granted JPS57143734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56028783A JPS57143734A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56028783A JPS57143734A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Publications (2)

Publication Number Publication Date
JPS57143734A true JPS57143734A (en) 1982-09-06
JPH0353689B2 JPH0353689B2 (en) 1991-08-15

Family

ID=12258008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56028783A Granted JPS57143734A (en) 1981-02-27 1981-02-27 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57143734A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624883A (en) * 1983-03-20 1986-11-25 Hitachi Maxell, Ltd. Magnetic recording medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS5354002A (en) * 1976-10-26 1978-05-17 Sony Corp Magnetic recording medium
JPS5565405A (en) * 1978-11-13 1980-05-16 Hitachi Ltd Ferromagnetic metal powder for magnetic recording medium
JPS5613526A (en) * 1979-07-11 1981-02-09 Tdk Corp Magnetic recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5256508A (en) * 1975-11-05 1977-05-10 Fuji Photo Film Co Ltd Novel magnetic recording medium
JPS5354002A (en) * 1976-10-26 1978-05-17 Sony Corp Magnetic recording medium
JPS5565405A (en) * 1978-11-13 1980-05-16 Hitachi Ltd Ferromagnetic metal powder for magnetic recording medium
JPS5613526A (en) * 1979-07-11 1981-02-09 Tdk Corp Magnetic recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624883A (en) * 1983-03-20 1986-11-25 Hitachi Maxell, Ltd. Magnetic recording medium

Also Published As

Publication number Publication date
JPH0353689B2 (en) 1991-08-15

Similar Documents

Publication Publication Date Title
JPS57154618A (en) Magnetic recording medium
JPS54143608A (en) Magnetic recording medium
DE2967056D1 (en) A magnetic recording medium
GB1430676A (en) Magnetizable particles
JPS56145525A (en) Magnetic recording medium
JPS57143734A (en) Magnetic recording medium
JPS5448504A (en) Magnetic recording medium
JPS57143735A (en) Magnetic recording medium
JPS57135436A (en) Magnetic recording medium
JPS5342010A (en) Preparation of magnetic recording medium
JPS54143114A (en) Magnetic recording medium
KR870002554A (en) High density magnetic recording magnetic component and magnetic recording medium using the same
KR880004439A (en) Magnetic recording media
JPS57205821A (en) Magnetic recording tape
JPS6479930A (en) Magnetic recording medium
JPS5339705A (en) Magnetic recording medium
JPS6467713A (en) Magnetic recording medium
JPS57198535A (en) Magnetic recording medium
JPS558618A (en) Magnetic recording medium
JPS57147130A (en) Magnetic recording medium
JPS57200936A (en) Magnetic recording medium
JPS6455731A (en) Magnetic recording medium
JPS5584043A (en) Magnetic recording medium
Yazawa et al. Thin Film Ferromagnetic Layer for Magnetic Recording Media
KR900003278Y1 (en) Vertical magnetic recording carrier